Save passage from book, right away (6)
I believe the answer is:
except
'save' is the definition.
(thesaurus)
'passage from book right away' is the wordplay.
'passage from book' becomes 'excerpt' (I've seen this before).
'right' becomes 'r' (common abbreviation).
'away' indicates named letters should be taken away.
'excerpt' with 'r' taken out is 'EXCEPT'.
(Other definitions for except that I've seen before include "Leaving out" , "Apart from, excluding" , "Leave out, exclude" , "Make a point of not including" , "Other than - saving" .)